Got muscles? Agility? Pent-up anger issues? You may need all of the above to keep on kicking. Staying injury-free isn't exactly the easiest thing to do in this job. 

And even if you remain relatively intact, once you start putting together a consistent losing streak or your physical condition begins to deteriorate, that may be the signal that the fight is over. You'll hang on as long as you can keep fighting and at least come close to winning.

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